So according to abubu, this is an anomaly that has a movie appeal to a viewer, so much that they never want to leave the movie theater.
To avoid the trap, you have to enter as a group, and each individual has to have a different appeal point towards the movie (Arai-san liked Hat-kun while Fennec liked Raccoon Dog, the herbivore thought the movie was scary while the carnivore thought that it could use more violence). This disperses the amount of appeal to each individual, enabling you to escape.
only one Otter of the The otter group able to escape because the movie appealed to all three of them equally.